Do you prune it in the winter? The flower buds form the previous fall.

Hi, do you know which species you have?, Catalpa bignonioides, nana, is more of a shrub, and rarely flowers.
They should be grown in fertile, moist but well drained soil, in full sun.
They are hardy, but unripened wood and young plants are prone to frost damage, they should be protected from cold winds.
Have you pruned the plant? and if so when?, Derek.

Thanks for your comments.I have never pruned my tree.Do you think I should try this and when.The tree must be about 8ft tall now.

The species I have is Catalpa bignonioides Aurea. Thanks

Hi, it could be that it's just too young yet, at 8ft it still has a way to go, they eventually reach about 30ft, I don't think I would bother to prune it, but if you do, it's pruning group 1, Derek.

Thank you so much for your advice.